Late reply due to work but,--
1) Collusion. Companies that work together in a manner to silence the speech of a political group or another company business operations are operating at a level of a political organization instead of a singular company. Many tech companies were involved in the bans because many twitter accounts, YouTube accounts and Facebook accounts got removed at the same exact time.
2)They did stop using those sites. But, the tech companies colluded to take alternate sites down.
3)Yes if you are going to take down an elected head of state from a platform you better have a damn good reason. Saying he incited a riot in a speech that he said three times in to peacefully protest in is hypocritical in the highest degree. Especially when I can find videos of the political left actually encouraging violence with no peacefully protest words ever being said in the video.
Not to mention in terms of riots the political left has killed far more people in 2020 the the political right. Both were wrong. The sheer hypocrisy over what one side is allowed to do versus the other side is allowed is telling though.